必须要有足够的睡眠，每天至少八个小时的休息时间。
翻译是：You must have enough sleep, at least eight hours a day.
句子解释：
enough 英[?n?f] 美[?n?f]
adv. 足够地，充足地; 十分地;
adj. 足够的; 充足的;
n. 充分，足够; 满足;
[例句]They had enough cash for a one-way ticket
他们有足够的钱买单程票。
sleep 英[sli:p] 美[slip]
vi. 睡，睡觉;
vi. 睡，睡觉; 睡眠状态;
vt. 为…提供床位; 提供住宿; 以睡觉打发日子;
[例句]They were exhausted from lack of sleep
由于缺乏睡眠，他们非常疲惫。
at least 英[?t li:st] 美[?t list]
adv. 至少;
[词典] 无论如何，反正;
[例句]He's been away for at least a week.
他走了总有一个星期吧。