I’ve been battling insomnia (terminal variety, waking up at 2am for good) for about 2 months. I’ve also been experimenting with zinc picolinate during that time. I’ve taken zinc carnosine, zinc aspartate, zinc bisglycinate and others over the years with no problem. I had no idea zinc picolinate could cause sleep issues, but I ceased taking it about 1 week ago and gradually my sleep improved until 2 days ago I got a full 8 hours without any sleep support at all! Then, yesterday, thinking that my angular cheilitis is caused by zinc deficiency, took 30mg before bed and have been awake since 2am again! I also get other symptoms like wanting to grind my jaw and fidget. Does zinc do this to anyone else, particularly the picolinate version?