How to train yourself to sleep on cue?

i guess there are elogs over here, but i've not come across them yet. i'm in a rural area and the company, while one of the larger ones for the area i'm in, only has about 10 trucks. they have paper running sheets. logs would become more of an issue if i was doing east-west runs.

the medication i take to sleep is quetiapine. it doesn't show on any standard drug tests, was't seen as an issue when i got my license and doesn't leave me feeling groggy or hungover the next day.

the first driving job i got was as a team driver (we call it two-up over here). we'd deliver urgent loads to the mines up north and the trips were around 30-36 hours. it was dreadful. i simply could not sleep in the moving vehicle, so by the time we got back, i was so tired it wasn't even funny. i only did 3 trips because i recognised pretty quickly how dangerous it was, driving that tired. the time pressure was enormous, too. as soon as one load was back, there was another team waiting to take the truck up with something else, so when it was my turn to drive, i just had to suck it up and drive, no matter how tired i felt. horrible, horrible job!

with this new job, most the runs are between 10 and 14 hours. i find that at around 10 hours, the fatigue really starts to kick in. if i find a just can't nap on the longer runs, probably getting out and running a few laps around the truck every hour would probably be the next best thing. if the runs were a whole lot longer, i could park up, take my meds and sleep for 7 or 8 hours, then get going again. if the runs were shorter, i wouldn't even need to think about napping.