My phone randomly sent my CURRENT location to someone whenever my phone was off when i was asleep

Your phone will not have shared your location unless it it been pre-set to do so - perhaps inadvertently.

Also, a phone which is indeed “off” couldn’t have sent anything. Did you perhaps mean to say that it was “locked?”

Regardless …

These checklists and guides might help you track-down - and stop - the cause of the behavior you’ve observed:

How to stop sharing your iPhone or iPad location – Apple Support (AU)

How to stop sharing your iPhone or iPad content – Apple Support (AU)

See who has access to your iPhone or iPad – Apple Support (AU)

Personal Safety User Guide – Apple Support (AU)