[johnny]

Yuki:

Try set a schedule for sleeping, and stick to the schedule. It takes your body two weeks to adjust itself to a new circadian rhythm, and any deviation from the schedule - pulling an all-nighter, sleeping for a longer period of time, or sleeping for a shorter period of time - will mess it up and you'll have to start again. If you don't let your body adjust to a sleep schedule, it won't have the proper energizing effect.

Also, try to keep your schedule in 90-minute installments, which is the amount of time the body needs to cycle through all four stages of sleep. That means the best sleep is for about seven and a half hours.

Barring that, it could be your actual bed that's causing the problem. I know that my current sleeping materials (a pile of blankets on the hardwood floor. xD) isn't exactly helping me to be bright and sunny in the morning.