sleep

Because you have a better diet now your body is less sluggish (not bogged down by crappy foods) and you are more energised. You should maybe try a light bit of excersise even if its just a short walk around the block

Your not eating enough, your body needs energy to sleep. From your other forum post you said you were only eating 1200.

Please read this and re-evaluate your diet:

http://www.myfitnesspal.com/topics/show/654536-in-place-of-a-road-map-2-0-revised-7-2-12

This ^^