Strange presence at night whilst sleeping.
In the name of Allah, the most Beneficent, the most Merciful.
You should not worry about this presence you are feeling or experiencing. This may be another form of waswasa. (Satanatic insinuation)
The best way to address this problem, in the short term is not to think about it at all, the more you think about it the more it will escalate. In the long term, you could try the following method. My noble teachers taught me this method. You should sit for about 10 minutes every day, close your eyes and think that Allah (SWA) is watching you and his blessings and rahmat is descending to your heart.
Insha Allah, by the will of Allah (SWA), this presence that you are experiencing will go away.
Only Allah Knows Best
Mohammed Tosir Miah
Darul Ifta Birmingham