Multivitamin supplement ruined/changed my sleep for the worse

Hi Folks, i‘ve always been a deep sleeper throughout my entire life sleeping 9-10hours on average.

recently(3 1/2 months ago) i wanted to take my nutrition more seriously and decided to take a multivitamin.

i noticed that i would fall asleep easier but i only can get 5-6hours ( sometimes even 4 hours) of sleep max.

to be fair when i wake up i feel ready and fully awake somehow i even feel like jumping out of the bed sometimes when i have stuff to do that i‘m excited about, this is unheard of for me because in the past when i used to sleep more, i would wake up tired and it would take me at least an hour to get out of bed and start my day.

This all sound great however, i noticed my face overtime looking tired and overall my productivity decreased since i‘m a night type of person (aka night owl), this is also due to my (self diagnosed) ADHD, i can only fully concentrate or learn/study best at night.

Do you guys have any suggestions ? should i take vitamins separately ? If so which ones ?

Thanks in advance!