sleep study

Dear Dr.,
I just had my 3rd polysomnogram and MSLT. I slept about 3-4 hrs., somewhere around 2-6 a.m. I woke up at least 10 times, it wasn't very restful. The tech told me it was enough for them to come up with something, he felt it was normal.  What I am wondering is, how can they know if it's normal if it isn't how I normally sleep?  Also, for the MSLT, I would just about dose off, or I would, and just as quickly, wake up (it was a bit noisy and I wake at any little thing).  So, how can this be helpful to them, it wasn't my norm and it would've been different without the noise? (The MSLT tech tells me they will have completed their sound proof sleep lab in a couple of months, but I don't see getting a 4th study).
Thank you for your time and input.  Have a good day.

[CCF Neuro[P] MD, RPS]

Dear jan:

I am not sure what to tell you, because you did not tell me what you were being evaluated for.  But, the studies may be adequate.  Having sleep for most of the early part of the night, if you had slow wave sleep, normal sleep latency, sleep stages of approximately normal duration (Stage I, II, III, IV).  If the REM onset was after a certain time period of latency.  The MSLT, we look for early onset REM and if you fell to sleep several times then they should have gotten enough information.

Sorry, I probably not helping much.

Sincerely,

CCF Neuro MD