Sleep and Appetite: Why You Crave Sugar When You’re Tired

After a bad night, the biscuit tin seems louder than usual. That isn’t a lack of willpower. Sleep and appetite are closely linked, and a short night can tilt the odds against you.

What happens when you sleep too little

Studies in adults suggest that short sleep can change the hormones involved in hunger and fullness, increasing appetite and making high-energy foods more appealing. Tiredness also affects the brain areas involved in self-control and decision-making, so the sensible choice feels harder at exactly the wrong moment.

The cravings pattern

• You wake up unrefreshed and reach for caffeine and something sweet.
• By mid-afternoon, energy dips and snacks become more tempting.
• By evening, you’re hungry and tired, and dinner turns into grazing.
• You go to bed late, and the cycle repeats.

Ways to break the cycle

1. Protect your sleep window. Most adults do best with around seven to nine hours.
2. Keep regular times. Going to bed and waking up at similar times, even at weekends, helps your body clock.
3. Eat properly during the day. Meals with protein, fibre and some healthy fat reduce evening grazing.
4. Watch caffeine timing. Many people sleep better if they stop caffeine by early afternoon.
5. Wind down. Dim lights, put screens away for the last half hour and try a warm shower or a book.
6. Get daylight early. Morning light helps set your body clock.

On a tired day

Set yourself up for it. Have an easy, filling breakfast, plan a proper lunch, keep fruit, nuts and yoghurt to hand, and forgive yourself if you eat more than usual. One short night isn’t a disaster.

When sleep problems need support

If you struggle to sleep most nights for several weeks, snore loudly, stop breathing during sleep, or feel exhausted despite enough hours in bed, speak to your GP. Sleep problems are common and often treatable. Good sleep is one of the quietest forms of appetite management you have.

Curious how your sleep, meals and energy fit together? MyFreeHealthReport’s free questionnaire (affiliate link) can help you reflect on your daily habits.

Keep reading: Sleep and Recovery or Eating for Energy.