Basically the reason I asked is because I used to have a white noise machine that would end after 30 minutes and I would also be asleep before it went off but now I find myself awake after it turns off
https://answers.yahoo.com/question/index?qid=20151031110242AAo5Q8l
https://answers.yahoo.com/question/index?qid=20151031110242AAo5Q8l