白天嗜睡

sleepless night───不眠之夜

If there is excessive daytime sleepiness and desire to nap, in spite of adequate sleep time, this might suggest a sleep disorder warranting further evaluation.───如果白天有很强的睡意，想小睡一会，虽然有充足的睡眠时间，这也许意味着睡眠障碍需要进一步评估。

Sleep apnoea can cause daytime sleepiness, and in some cases can cause the sufferer to fall asleep without warning.───睡眠呼吸暂停症是由于白天嗜睡所引起的，并且可能会导致在某些完全没有意识到的情况下睡著。