ANSWER:

This is totally baseless and it’s a superstitious belief that has got nothing to do with islam. This would mount to shirk.

Sheikh is there any good day or bad days in islam ?lik fr eg Tuesday and Saturday is a bad day to start anything new lik getting married or starting new venture etc

Shirk and its different forms, Superstitions | April 13, 2022 2:41 am
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When starting to do something if something goes wrong does this mean it’s a sign that the whole task might go wrong?for example if I’m going on a journey and just when we put the vehicle to the road an accident nearly happens.so does this mean our journey will be unsafe?is this kufr/shirk? If so am I accountable because I believed this out of ignorance?
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Our sheikh used to say it is makrooh to sleep after asr prayer, because Muhammad pbuh said that one can lose his reason and mind, but i find it to be daif. Is there any other basis to this? Why would someone go insane from sleeping after asr?