We have the hadith
... Whenever you go to bed perform ablution like that for the prayer ... -- Sahih al-Bukhari 247 (sunnah.com); see also Sahih Muslim 2710 a (sunnah.com)
However, sleeping (or, at least, deep...
In many Islamic countries they believe that one can get possesed by jins. However non muslims do not believe this and they say it is just a health (mental) problem when someone behave in a not...