Caffeine is the principal substance in most energy drinks that increases alertness and perceived “energy”. The amount of caffeine in energy drinks is not regulated and varies widely, from as little as 50 to as many as 500 milligrams per can or bottle (most coffee drinks have 50 to 200mg). Research has shown that the alerting effects of caffeine can be detected at 25mg and increase proportionally to at least 400mg. That alerting effect may be helpful if used during the daytime to combat sleepiness due to a poor night of sleep, especially if you need to drive or study. But, if taken within about 5 to 6 hours of bedtime, it will probably make it difficult to fall asleep and stay asleep. Importantly, caffeine should not regularly be used to “replace” sleep.
Articles in this section
- How does sleep relate to weight?
- How much sleep do I need?
- What is a Pre-Bed Routine?
- What should I avoid before bed?
- What are some good pre-bed activities?
- Why is sleep important?
- Do energy drinks affect sleep?
- How do nicotine and smoking tobacco affect sleep?
- How does nutrition affect sleep?
- Should I read or watch television in bed?