Recently, I started exercising in the morning. The exercises are of a moderate level which includes a one hour of brisk walking and a few bodyweight exercises. But soon after exercise, I feel sleepy and I sleep for the whole day. I am unable to understand what the problem is. If these things can help Firstly, I take nearly 4-5 hours of sleep daily and wake up fresh. Secondly, I eat nearly 2000-2100 calories daily. Thirdly, I am 27,(6" 2') and a weight of 210 lbs. Please assist. Thanks.