Allowing the computer to sleep until pulsating light dies out

Hello there!
This is just a minor question.
I'm using a MBP Core Solo. Without the power adapter plugged in, if the computer goes to sleep because of low battery, is it harmful to the hard disk and other hardware to allow it to sleep for a prolonged period of time (more than 5 hours?) until the pulsating light goes out (possibly indicating that the remaining charge has been used up)?
Assuming it is alright to lose any unsaved changes in the open applications, is it necessary for the benefit of hardware (and is it possible at all) to wake it up and shut it down after it goes to sleep due to low battery if I wont be able to plug it in before the pulsating light runs out?
Thanks!

All that will happen is your computer will shut off and/or your battery will go dead.
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