General information only, not medical advice. If you have persistent sleep problems, speak to a doctor or qualified health professional.
This guide is for an adult with a full schedule who is sleeping six hours or so on weeknights, catching up at weekends, and feeling it by mid-afternoon. Perhaps a parent of young children, a shift worker or someone whose phone comes to bed with them. The advice here will not cure a sleep disorder, but small, specific changes to light, timing and habits help many people sleep longer and wake feeling better.
How much sleep adults actually need
The US National Heart, Lung, and Blood Institute lists recommended sleep by age; for adults 18 and older it gives 7 to 8 hours a day. It also explains the idea of sleep debt with a simple example: lose 2 hours a night and after a week you owe 14 hours. One long Saturday lie-in does not repay that.
The same page notes that some groups are more likely to be short of sleep, including caregivers, people working long hours or more than one job, shift workers and people whose work involves frequent travel. If you are in one of those groups, the changes below still help, though you may need to adapt the timing.
Fix the anchor: a consistent wake time
If you change only one thing, make it the time you get up. Your internal clock is set largely by when you wake and when you see light, and a wake time that moves by two or three hours between weekdays and weekends works like a small dose of jet lag every Monday.
Choose a realistic time
Pick a wake time you can keep seven days a week, within about an hour. For many people that means setting the weekend alarm a little later than weekdays rather than abandoning it.
Let bedtime follow
Count back 7.5 to 8.5 hours from the wake time and treat that as your target for being in bed. If you are not sleepy then, stay up a little longer instead of lying awake; sleepiness tends to arrive earlier once the wake time is stable.
Use light on purpose
Light is the strongest signal to the body clock. Bright light in the morning helps you feel alert and sleepy earlier in the evening; bright light late at night pushes sleep later.
In the morning
Get outside within an hour of waking, even for ten minutes. Daylight on an overcast day is far brighter than ordinary indoor lighting. A walk to the bus, coffee by an open window or a quick loop round the block all count.
In the evening
Dim the main lights in the last hour or two before bed and switch to lamps. Lower screen brightness, use night modes, and if possible keep the brightest screens out of the bedroom.
If you change only one thing, make it the time you get up.
Rethink caffeine and alcohol
Caffeine
Caffeine stays in the body for hours after the cup is empty, so an afternoon coffee can still be working at bedtime. Many sleep specialists suggest a cut-off around early afternoon. The US Food and Drug Administration notes that for healthy adults, 400 milligrams a day is an amount not generally associated with negative effects, but sensitivity varies, and the timing matters for sleep as much as the total.
Alcohol
A drink can make you drowsy, but alcohol tends to fragment sleep later in the night, so you wake more and feel less rested. If you notice poor sleep after drinking, try moving drinks earlier in the evening or skipping them on weeknights.
Make the bedroom work for sleep
| Factor | Aim for | Small change to try |
|---|---|---|
| Darkness | Dark enough that you cannot see your hand clearly | Blackout curtains or an eye mask |
| Temperature | Cool rather than warm | Lighter duvet, open window, fan |
| Noise | Quiet or steady background sound | Earplugs or a white-noise machine |
| Devices | Out of reach | Charge the phone in another room; buy a cheap alarm clock |
| Bed use | Sleep and intimacy | Work, scroll and watch TV elsewhere |
The last row matters more than it looks. When the bed becomes a place for email and video, the brain stops linking it with sleep.
Build a short wind-down routine
A predictable 20 to 30 minutes before bed tells the body that sleep is coming. It does not need to be elaborate.
- Set a “devices down” alarm an hour before your target bedtime
- Prepare tomorrow’s clothes, bag or lunch to clear the mental to-do list
- Write down anything on your mind on paper, then close the notebook
- Take a warm shower or bath
- Read something on paper, in low light
If you cannot fall asleep
If you are awake for what feels like more than 20 minutes, get up, go to another room with dim light and do something quiet until you feel sleepy. Lying in bed frustrated teaches the brain that bed is a place for worry. This is a core part of cognitive behavioural therapy for insomnia, which is the first-line treatment recommended by many sleep medicine bodies.
Daytime habits that help the night
Move during the day
Regular physical activity is associated with better sleep for many people. A brisk walk counts. Very hard exercise close to bedtime keeps some people awake, so experiment with timing.
Keep naps short and early
If you nap, keep it to 20 or 30 minutes and before mid-afternoon. Long or late naps reduce the sleep pressure you need at night.
Eat dinner a little earlier
A large, heavy meal right before bed can cause discomfort and reflux. Finishing the main meal two to three hours before bed suits most people.
If you work shifts
Shift workers face a harder version of the same problem, because work demands sleep at times the body clock resists. The principles still apply, with some adjustments.
Protect a core sleep block
Even if the timing changes between rotas, try to keep one block of at least four hours at the same time on work days and days off. Many people on nights sleep from roughly 9 a.m. to 1 p.m. on both.
Control light on the way home
After a night shift, wearing sunglasses on the commute and going straight into a darkened bedroom helps prevent morning light from waking the body clock up.
Make daytime sleep possible
Blackout blinds, earplugs, a “do not disturb” sign and an agreement with the household about noise are not luxuries for a shift worker. They are the equivalent of night for everyone else.
Plan the switch back
On days off, a short nap after the last shift and an earlier-than-usual night help you rejoin daytime life without losing an entire day.
Common sleep myths
Some popular ideas about sleep do more harm than good.
- “I can train myself to need less.” People who cut sleep often stop noticing how impaired they feel, which is different from needing less.
- “Weekend lie-ins fix the week.” They help a little, but long lie-ins shift the body clock later and make Monday harder.
- “A nightcap helps.” Alcohol may help you drift off but tends to worsen sleep later in the night.
When to see a doctor
Some sleep problems need professional help. NHLBI suggests talking to a doctor if you regularly feel unrested even after 7 to 8 hours or more. Other signs worth raising include:
- Loud snoring, gasping or pauses in breathing noticed by a partner
- Falling asleep while driving or in conversations
- Trouble falling or staying asleep most nights for three months or more
- Uncomfortable sensations in the legs at night that ease with movement
Sleep apnoea, insomnia and restless legs syndrome are common and treatable.
Two-week sleep experiment
Try these for 14 days and keep a one-line note each morning of when you slept and how you felt:
- Same wake time every day, within an hour
- Ten minutes of outdoor light before 10 a.m.
- No caffeine after 1 p.m.
- Lights dimmed and devices down an hour before bed
- Phone charging outside the bedroom
- Out of bed if awake longer than about 20 minutes
Takeaway
Adults need around 7 to 8 hours, and most of the gains come from a few unglamorous habits: a fixed wake time, morning daylight, an earlier caffeine cut-off and a dark, device-free bedroom. Run the two-week experiment, and if you still wake unrested, see a doctor.
