This item separately describes drug induced passages similar to Near Death Experience. A fairly good one as well although some aspects are not seen in recent work, or if seen are interpreted differently.
What is important is that this was extensively known in what appears to be texts supporting Egyptian spirituality.
This to us remains mostly lost knowledge and add out recent criminalization of most of this, we have a very poor understanding of what is possible and safe.
He shall be covered and made so that in his struggles he rise not. His voice is heard speaking in a strange tongue, as he calls on his fathers who have gone before and now preside over affairs beyond the Wide Lake. His body becomes still, as he enters the dazzling chamber which is the doorway to twin vision.