From last few years I feel sleepy all the time. When I am in activity it is fine but as soon as I sit down I kinda get very sleepy. Daysleep more deep?

Fatigue. Sleep disturbance. Possible sleep apnea associated with being over weight and snoring. Failure to achieve stage three sleep most restorative interrupted by difficulty breathing. Testing sleep study. Diagnostic. Treated by surgical intervention and specialized breathing apparatus with a number of approaches. Need to start by discussion and examination with physician.
Chronic fatigue. Chronic fatigue is quite common. Common also is poor sleep quality. Good health habits include good nutrition, good exercise and good sleep. Work on these issues. Develop appropriate health habits. Get a thorough medical evaluation. Then discuss your fatigue issues with your doctor.