I didn’t do it much but about 5yrs ago I tried the magnesium gel partly for me/cfs and partly for an injury that led to leg spasms.
I found the awkward combo of it making my legs sticky and sending me to sleep within 20mins - that genuine can’t keep eyes open type (that strangely social media videos on my phone give me within minutes when bigger tv doesn’t) . Awkward because yes I’d need to lie down (tho not the same as the ‘I need to lie down’ I get when I need to lie one side of my face on pillow and body to then the other it isn’t unrelated, more pass out on sleepiness slightly less of that omg my face:/head needs this exact position) just when I’d make my bedsheets all sticky..
But it want long sleep like the promise of taking magnesium for sleep quality type thing, just making being ‘awake’ difficult and I can’t remember how long later I’d then wake up from that but I’m not sure it was ‘put in deep refrshing sleep’ stuff otherwise I’d have still been using it