Although the snooze button may seem like a gift from the Almighty on Monday mornings, sleep experts agree that hitting the snooze button contributes to a tired morning and doesn't help you feel more rested.
While you might think that hitting the snooze button will give you a chance to finish your natural sleep cycle and wake up feeling rested, well that's not what really happens. After you hit snooze and drift off, your brain starts its sleep cycle all over again. When the alarm goes off a second time, you're likely at an even deeper, earlier part of your sleep cycle, which results in you feeling even worse than you did the first time leaving you feel groggy.
If you regularly wake up feeling groggy, possibly the trouble may be that your alarm is going off at the wrong part of your sleep cycle. Scientists have identified the culprit behind this, the sleep inertia.
The National Sleep Foundation defines this state as "the feeling of grogginess and disorientation that can come from awakening from a deep sleep."
It slows down your decision-making abilities, impairs your memory and hurts your general performance once you do get out of bed. Even worse, coffee and a cold shower can't combat it: It can take up to an hour and a half to shake off the sleep - inertia grogginess.
Try setting your alarm a few minutes later (or getting up a little earlier) and sticking to a regular sleep schedule to get rhythms going.