同时，年纪大的人常常睡不沉，夜里时常醒来，这可能使他们白天经常打瞌睡的原因。

Also, older people often sleep less deeply and wake up more often throughout the night, which may be why they may nap more often during the daytime.

youdao

同时，年纪大的人常常睡不沉，夜里时常醒来，这可能使他们白天经常打瞌睡的原因。

Also, older people often sleep less deeply and wake up more often throughout the night, which may be why they may nap more often during the daytime.

youdao