Waking Up?

[_Hello_]

I have two questions . Firstly, Could someone please tell me how i can wake myself up mentally or pyschologically without the use of devices such as alarm clock and that or anyway you can mentally wake urself up in da morning? Another thing  i'd like to know althought i sleep in a freezing cold room that people say, i dont actually feel it and wake up sweating buckets, why could this be and its not like im hot or anything? Thanks.