You'd better go to bed and nurse that cold.
你最好上床睡觉，把感冒治好。
Please turn the television off before you go to bed.
睡觉前请关上电视。
I go to bed early as a rule.
我一贯睡得早。
I think I'll have a bath and go to bed.
我想洗个澡，然后睡觉。
I go to bed early if I'm travelling the next day.
如果第二天去旅行我就早睡。