Updated August 2026 · Mind & Sleep · 8 minute read
Many of the readers who write to us describe the same frustration. They go to bed at a reasonable hour, they stay there for seven or eight hours, and yet they wake up feeling as though they have barely slept. By mid-afternoon they are reaching for a third cup of cha and struggling to concentrate. If that sounds familiar, the problem is often not how long you sleep but how well.
Your body clock wants consistency
The human body runs on a roughly 24-hour circadian rhythm that governs when we feel alert and when we feel sleepy. That rhythm is set largely by light exposure and by the regularity of our routines. Going to bed at 11 PM on weekdays and 2 AM on weekends, then sleeping until noon on Friday, is the equivalent of flying across several time zones every week. Choose a wake-up time you can keep seven days a week, and let your bedtime settle naturally around it.
The evening cha problem
Caffeine has a half-life of around five to six hours in most adults, which means half the caffeine from a 6 PM cup of tea or coffee is still in your system at midnight. You may fall asleep, but caffeine can reduce the deeper stages of sleep that leave you feeling restored. Try moving your last caffeinated drink to before 3 PM for two weeks and notice the difference.
Screens, light and the late-night scroll
Phones in bed are a near-universal habit. The issue is partly the light and partly the content: news, messages and short videos keep the brain alert precisely when it should be winding down. Set a “phone curfew” 30 to 60 minutes before bed, charge the phone outside the bedroom if you can, and use a simple alarm clock instead.
Make the room work for sleep
- Cool: a fan or air conditioner set to a comfortable temperature helps; overheating fragments sleep.
- Dark: blackout curtains or an eye mask block street lights and early sunrise.
- Quiet: foam earplugs or a steady background sound from a fan can mask traffic, construction and late-night horns.
- For sleep only: try to keep work, eating and long phone calls out of the bed.
Heavy dinners and late meals
In many households dinner is served at 10 PM or later, often the largest and richest meal of the day. Going to bed on a very full stomach can cause discomfort and reflux. Where possible, aim to finish eating two to three hours before sleep and keep dinner lighter than lunch.
When tiredness is a medical signal
Persistent fatigue despite good habits can have medical causes, including anaemia, thyroid problems, depression or sleep apnoea. Loud snoring with pauses in breathing, waking up gasping, or falling asleep during the day while driving or working are warning signs. Please see a registered doctor rather than relying on self-help alone.
A two-week experiment
Pick three changes from this article, write them down and keep them for 14 nights. Fix your wake-up time, move your last cha earlier and introduce a phone curfew. Rate how rested you feel each morning from one to five. Small, consistent adjustments usually beat dramatic overhauls.
Find more on rest and recovery in our Mind & Sleep hub. This article is for general education and does not replace professional advice; see our disclaimer.