waking up fresh and energized

Some people even if they sleep for 4 hours at night they are so productive in day time because they have enough extent of good quality deep sleep at night whereas some people who sleep 8 hours every night still struggle to open their eyes throughout whole day without feeling drowsy I request...

Some people even if they sleep for 4 hours at night they are so productive in day time because they have enough extent of good quality deep sleep at night whereas some people who sleep 8 hours every night still struggle to open their eyes throughout whole day without feeling drowsy I request...