If you plan to stay up all night in order to study, play MMORPGs, or work by taking large amounts of coffee, you're in for one heck of a ride come daytime. According to studies, drinking caffeine wreak havoc on daytime sleep even after a night of sleep deprivation.

An experiment was made where a number of people took coffee before their normal sleeping hours (read: night time) and eventually they had an extremely hard time at achieving deep slumber: they had less Rapid Eye Movement (REM) sleep. The results suggest that taking it during the usual sleeping hours worsens sleep quality.

So why does it happen? The researchers said that caffeine daytime effects were due to the fact that most of the subjects were trying to fall asleep when their bodies was shouting to keep them awake. Taking coffee at night makes it even worse by allowing the "wake-up call signal" in the body stronger.

Although the article never gave any suggestion, it's implied that people should refrain from taking too much coffee and, if their occupations won't permit it, find a suitable alternative like eating apples or taking some legal, medical stimulants. If you have any other suggestion, fell free to write them down in the comments section below.