Irregular sleep-wake pattern , which presents as sleeping at very irregular times , and usually more than once per day -LRB- waking frequently during the night and taking naps during the day -RRB- but with total time asleep typical for the person 's age .
Their sleep is usually normal .
Their sleep is usually normal .
让这件事变得更简单: Irregular sleep-wake pattern , which presents as sleeping at very irregular times , and usually more than once per day -LRB- waking frequently during the night and taking naps during the day -RRB- but with total time asleep typical for the person 's age . 输出: