Sleeping pills don't work

Started several weeks ago.

I got a phone call from dad's caregiver, John.

'We have a little problem; Dad isn't sleeping well at night'.

Turns out that he goes to sleep early (he always did, but not so early), wakes up several hours later to go to the bathroom.
Then John 'puts' him back to bed. (i.e. physically put's him back into bed. Dad lost his coordination, and can't get back into bed alone. Dad is not lightweight, and that doesn't make it an easy task.)

[And here the action starts:]

5 minutes later, dad is still lying in bed awake, and can't remember if he's already gone to the bathroom or not.
Dad get's out of bed.
'What do you want, dad?'
'I want to go to the bath room'.
'You just went to the bathroom'.
'I did?'
'Yes, you did'.
'OK. Then I guess I want to go back to bed'.

John physically put's dad back in bed.

5 minutes later, and dad is out of bed again.
'What do you want, dad?'
'I want to go back to bed'.
John physically put's dad back in bed.

5 minutes later...

you get the idea.

We already tried 3 types of sleeping pills. Either with no efect, or with opposite effect (they arouse dad...).

John collapsed.

We've been taking turn leaving our families for the night, and sleeping (or to be more accurate - not sleeping) in dad's place.

We're anxiously awaiting to see an Alzheimer specialist in several days.
John said he's counting the days (or is he counting the nights?) until the doctors appointment.