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Is there any app or log that says when my MacBook Pro's hard drive last went into sleep mode? I ask because each night when I close the MBP's lid without being plugged into a power source, the power light goes into its snooze rhythm but the battery is half-drained by the next morning. It certainly looks like it is asleep, but the power drain seems to indicate otherwise.

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+1 My macbook does the same thing. I thought this was normal. – Frank V Apr 2 '10 at 14:21
My macbook does the same thing. I'm going to assume you're running OS X 10.6, since the battery-drain while sleeping seemed to get much worse for me after upgrading. – Will Eddins Apr 2 '10 at 14:26
Same here. My Toshiba can sleep for almost a week, but my OS X 10.6 MacBook hardly manages one night. – Paul Lammertsma Apr 2 '10 at 16:21

I put my macbook to sleep and checked system.log file. Then I used mdtuil to reindex spotlight (which prevents the hard dive from sleeping while its indexing) then I put it to sleep again. I compared the log entries from both sleeps and there was no difference. So it looks like this can't be done using OS X logs.

Read through this Apple support page Mac OS X: Why your Mac might not sleep or stay in sleep mode and see if anything there helps you.

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It doesn't explain why you're losing quite so much power, but don't forget that the battery will drain whilst the Mac is asleep anyway at around 1% an hour.

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Yes, but my battery is way passed its prime. Its condition in System Info is "Replace Now" even though the cycle count is only 351. – flipdoubt Apr 2 '10 at 20:56

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