Achieving a good night’s sleep often feels like solving a complex puzzle. Even when following well-known sleep tips—like an early bedtime, avoiding screens, and winding down calmly—many still struggle to get restorative rest. This is because sleep is affected by a variety of factors including stress, hormones, light exposure, temperature, exercise timing, and notably, the drinks you consume.
While most people know caffeine disrupts sleep, there’s another common beverage culprit: alcohol. Though a glass of wine or a pint of beer might make you feel sleepy initially, alcohol actually harms your sleep quality. Sleep experts from Bed Kingdom emphasize that drinking alcohol close to bedtime leads to fragmented sleep and frequent night awakenings.
Research shows that consuming alcohol within four hours of going to bed can shorten your overall sleep duration and increase “wake after sleep onset” (WASO), where you wake up during the night and have trouble falling back asleep. The NHS adds that alcohol dehydrates the body, leading to restless or poor-quality sleep, and paradoxically acts as a stimulant, worsening insomnia.
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Similarly, nicotine is another substance that disrupts your sleep. Nicotine interferes with the body’s ability to fall and stay asleep, contributing to insomnia.
Caffeine’s effects are perhaps better known, but it’s important to remember how long it remains in your system. Studies indicate caffeine has a half-life of about five hours, meaning it can continue impacting your sleep long after consumption. Experts recommend cutting off caffeine intake 8 to 12 hours before bedtime. For example, if you go to bed at 11 pm, consider avoiding caffeine after 1 pm and switching to decaffeinated options in the afternoon and evening.
If sleep difficulties persist for more than a month despite cutting out alcohol, nicotine, and caffeine close to bedtime, experts advise consulting your GP to explore other causes and possible treatments.