Go to sleep too late and wake up too late? Having a delayed sleep pattern could be 'Delayed Sleep Phase Syndrome' (DSPS). DSPS is believed to be a disorder of the body's internal clock - the circadian rhythm. DSPS sufferers have difficulty falling asleep and waking as their circadian rhythm is out of sync with regular sleeping and waking times i.e. sleeping at night and waking in the morning. This sleep infographic has more information.