Options are:
[1]. You'll be tired from staying up late, but resist the temptation to sleep in. That will only make it harder come nighttime! Stay busy all day.
[2]. This will also give you a good night's rest. Don't overdo it though, though, or you will end up with little pieces of memory lost the night before.
[3]. This will help you gradually get used to the darkness. Stay up till dawn the next morning.
[4]. Don't do this at the same time every day or it can interrupt a full night's sleep. Studies have shown that staying up past the one hour mark or one hour is a better night than getting up at either.Choose from options above and answer: What most naturally follows?

How to fall asleep on christmas eve without any medicine 
On 23 december, stay up late. 
Figure on at least two hours past the time you normally go to sleep. 
On 24 december, wake up around two hours earlier than usual.
Answer:
[1].