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A number of users have reported an issue in which Mac OS X 10.6.x (Snow Leopard) is slow to go to sleep. In these cases, the system will stay awake for 30 seconds to several minutes before entering sleep mode. Fixes Check printer queue. This problem may be caused by items stuck in the print [...]

Apple has released updated printer drivers for Mac OS X 10.6.1 or later: HP Printer Drivers v.2.4.1 Epson Printer Drivers v2.4 For a list of printer and scanner models supported by these releases, see this Apple Knowledge Base document.