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.

  • +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.


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.

  • 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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