Following the planned time will ensure you have enough sleep to get to those early classes and stay wide awake.

按照计划时间睡觉，将确保你能得到充足睡眠后去上早课，保持清醒。

When driving, you must stay wide awake.

开车时，你必须保持完全清醒。

You have to stay wide awake in his class and pay careful attention if you want to pass his final exam later on.

你如果想在以后能通过他的期终测验，上他的课时，你就得保持清醒并十分专心地听。

You must stay wide-awake against possible dangers.

你必须保持警惕，防止可能的危险。