Generally it doesn't make sleeping specially difficult for me, but during my 4 days experiment I did notice that my quality of sleep was shitty. I woke up earlier than intended, feeling tired but couldn't manage to get back to sleep (BTW, this seems to happen to me with alcohol too).
I would strongly recommend using this drug for the most part, because it definitely costs you some karma points in some very important places as Solipsis mentions. This is definitely a functional anti-depressant for me for the most part but I feel like 90% of people who I give a small dose of this to will have an unpleasant reaction. This is really kind of garbage head territory imo, and best left for people who are desperate to overcome desperate times.
Otherwise, using it functionally can work for a few people and I think that's fine, i just don't think this drug is anything we should be promoting at all. While my bandmates all agree I play like Geddy Lee while using it, ultimately my emotional shifts make it a little too much to handle in the end. After my current bag is gone, I won't be using any PCP derivatives for a long time. Gonna move to mellower substances. Probably just milder dissociatives, milder empathogens and psychedelics. I couldn't be more thankful for how its helped me though.