Please help:difficult examination officer, late start exams and supervison

I'd ring up the exam board ASAP and get them to confirm whatever is available to do, and send out written conformation that you can show to the officer.

Could you try falsely jet lagging yourself, e.g. going to bed and getting up 3 hours earlier than usual

So my exams officer managed to arrange with the exams board that I can have a late start for morning, however... she's still saying I need to be in school at nine o'clock under staff supervision and I can't fall asleep because it's a child protection issue (even though I'm 19).
I've accepted she won't let me have naps in rest breaks

Actual point: I've taken AS exams in two different exam centres, they've both moved my exams for me for the afternoon and had an exam boards form that my dad had to sign to say he'd supervised me (He'd take my mobile and netbook away before I went to bed etc). I'm now at a third centre; the exams officer doesn't believe me, says that I'm the first pupil she'd ever had who's needed their exams moved for health reasons etc and is telling the deputy head that it's against exam board rules for anyone other than the exam centre to supervise me.
My deputy head is a decent chap, and says that if I can provide evidence that this is allowed then of course they'll do it, but he has no idea about this sort of thing and can only go on the examination officer's word. So does anyone have an evidence? I can't find any info on the examination boards website. Or can anyone help me think of where I can get evidence or any other way to help because I'm stuck?

It's not that unusual to get permission for late starts for candidates with ME or similar problems. If you are in school, supervised, by 1000hrs (but absolutely no later) then there is no need for major paperwork (as long as your centre has the standard 0900 start and the exam lasts at least 1 hour). If candidates really need to sleep during an exam I've normally arranged for them to do the exam at home as it is so much easier for them to relax suitably there (I still remember one mother from whom you could pre-order your choice of cake if you were going to invigilate there and she'd bake specially.)

If you want to get to school later than 10 then the standard procedure is for the EO to get permission to use the overnight supervision form (normally used when a candidate has over 6 hours of exams in a day and needs to delay an exam until the following day). A responsible adult* (a parent is fine), will have to sign to say that they will supervise you, deny you internet access etc and physically hand you over to the exams officer (no dropping off outside the school) when you do arrive in school. I can't see any reason why you can't go to sleep in school if you need to (at any age), I've certainly had candidates do it, and I have had to collect at least 2 of my kids from schools when they were sick and got there to find they were asleep.

* It used to have to be a member of centre staff, but this was relaxed about 8 years ago when the child protection implications of taking a 16 year old home with you for the night freaked people out. I only did it once and the poor lad was completely unsettled by my 6 year old daughter watching him like a hawk the whole time.