I am working as a software developer from last 3 years. From last couple of days I have feeling of sleepiness in office. I feel sleepy, back of my head feels sort of heavy and my cognitive skills like ability to learn and reason also slows down significantly. I am keeping track of my sleep schedule and according to it I am sleeping around 7:30 hours each day. I sleep at around 10:15 in night and wakes up at 6:15 in morning.