MacBook - help with wireless/bluetooth

hello...

i got a new macbook coupla weeks back... my "problem" is that when i put the book to sleep (by simply closing the 'lid') and get it up again, wireless and/or bluetooth connections/devices are not detected... then i shutdown->reboot the book and all's well...

wats the remedy? is it a "fault"? or have i not done something that i am supposed to do? or have i done something that i am not supposed to do?

thnx...