Yes, it's the UB 90. I haven't even discovered the switch-back thing yet. I assume that it then remains on level 6 for as long as the remaining time is set. With any level, you can set up to 12 hours; that's enough for the whole night. To fall asleep, I like to set both zones to level 6 for 1-2 hours.
To kill any mites, you can heat the bed, covered, on the highest setting for 12 hours.
I wouldn't give the heated blanket away.