Improving sleep improves pretty much everything when it comes to nutrition, health and performance. It’s easier to eat well and train hard when vou sleep well. Many of us use caffeine not only to give us general energy through the day but also as a pre-workout boost. In fact specific caffeine based ‘pre-workout’ powders/drinks are sold to improve performance etc. How might this intake, be it from ‘normal’ beverages like tea/coffee or specific pre-workout drinks impact sleep?
We know caffeine can prevent or disrupt sleep. A recent study found that for caffeine to have minimal impact on sleep it requires a cut off time of approx 13 hours prior to sleep for pre workout, 9 hours prior to
sleep for coffee and no cut off time for a cup of black tea. If we based this on an example bedtime of 10pm a coffee would need to be consumed before 1 pm or pre-workout would need to be consumed prior to 9am. Higher doses of caffeine require longer time frames. This is why the review didn’t find much issue with black tea, but the duration for pre-workout was so long.
As a general guide the caffeine levels in common drinks are as follows:
Tea – 40mg (10-50mg),
375ml coke – 40-50mg,
Brewed Coffee – 80mg (40-110mg)
500ml Energy Drink – 160mg
1x serve pre-workout – 150-300mg
On average this study found that caffeine consumption reduced total sleep time by 45 min and sleep efficiency by 7%. These numbers listed here are averages and the half-life of caffeine does differ between people but for most people stopping caffeine a bit earlier in the day than you otherwise would can improve sleep quality and quantity
It’s also worth noting that these numbers are based on coffee or pre-workout in isolation. It is very common to have more than one source of caffeine in a day, which will add to the total amount of caffeine.
So if you’re struggling with sleep then consider this and perhaps make a small change which could have a huge positive impact.
Happy Tuesday 🤗xx




