Trashing noise when mbp wakes from sleep

oh now i've started posting i keep thinking of new things that don't seem right!
for the last few months i have noticed that when i wake my mbp up from sleep, it always makes a few strange noises much the same as when you empty the trash bin as it crunches stuff.
has anyone else had this and might know why its doing it - is it serious?
also, just going through my system profiler now to check some things - i have had the spinning ball again for quite some time which i hardly ever used to have.
when this starts happening, is it a sign of something serious with the machine and can i do anything?
thanks again

thanks sig for your response and i shall certainly give the rebooting a try from disc and running repair disk.
However, i am sorry if i have caused any offence but I am terribly confused about how i might have offended anyone by my use of shortcut language - the only thing i can see I've done is use the macbook pro initials which isn't unusual on this forum as i can see and not capitalise some of my letters.
'a modicum of respect' seems a little harsh and i haven't been pulled up on such things for many many years.........
i have always been very polite and very grateful on this forum.
strange world.

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