There is no ‘normal’ length of time, it is whatever is natural for you. We all feel sleepy at times but it is important that it is not disruptive to your daily life and general health. Regularly getting less than five to six hours of sleep a night is a no-go as it significantly increases the risk of stroke and heart disease, with evidence that not sleeping enough may ramp up the ‘fight or flight’ response to stress, releasing hormones that speed up heart rate and raise blood pressure.
According to statistical studies, the average number of hours for various age groups are: