Because the ego is a fiction, it disappears sometimes. The greatest time is dreamless sleep. So make it a point that sleep is very valuable; don't miss it for any reason. Slowly slowly, make sleep a regular thing. Because the body is a mechanism, if you follow a regular pattern of sleep the body will find it easier and the mind will find it easier to disappear.
Go to bed at exactly the same time. Don't take it literally -- if one day you are late you will not be sent to hell or anything! I have to be cautious, because there are a few people here who are health freaks. Their only disease is that they are continuously thinking of health. If they stop thinking of health they will be perfectly well. But if you can make your sleep a regular thing, going to bed at almost the same time and getting up at almost the same time... the body is a mechanism, the mind is too, and it simply slips into dreamless sleep at a certain moment.