Mac book goes into sleep mode it won't always come out the keyboard lights up but the screen will not

it seemed to start after i updated to OS X lion.

I have this same issue. When experiencing this issue I connected a wired mouse and selected/reviewed bluetooth device status which showed blutooth devices not connected. Trying to reconnect and/or restart the bluetooth devices (keyboard, mouse, and trackpad) did not work. Only a reboot solves the problem. Reseting the hardware does not prevent this issue.
Apple support informed me that this is a known bug and they are working on it. There is a bluetooth issue with supporting three bluetooth devices that manifests after sleep. My work around was to use only bluetooth keyboard and magic mouse. This solves the problem. After each OS patch is applied (in future) I plan to check and see if the issue is solved. I did not upgrade yet to to patches released in Feb. 2012 - so it might be fixed there (as part of the wifi sleep issue solution).

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    I apologize for the angst.  The problem has cost too much money in lost time and material because when it would automatically shut down after a few minutes, all my work was lost. 
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    Adding to my first post I can now advise that when the mac goes into sleep mode the light on the front stays on (it does not pulse so clearly it is not really sleeping).
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  • Mac Pro randomly goes into sleep mode

    My (mid 2010) Mac Pro, OS X.6.8, randomly goes into sleep mode and I can't wake it, have to power it off and reboot. Just started to the best of my knowledge Friday (Jan 6, 2012) I've had it happen surfing the web in Safari, while working on an illustration in Adobe Illustrator, while running Apple Hardware Test, using 23" LCD connected by HDMI and DVI-D, Disconnected monitor and connected 12" Cintiq (LCD Tablet).
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  • My iMac goes into sleep mode, won't come out until I unplug and replug the computer then hit the power button. Just hitting the power button alone won't restart the iMac.

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    Well hello there, and welcome to Macintosh.
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  • Macbook spontaneously goes into sleep mode and screen off mode

    Hi. My Macbook spontaneously goes into sleep mode and screen off mode with varying time between each instance. It usually goes for a few minutes or even hours without doing it and then will go through periods of fluctuation between the modes. I believe this to have started with a minor orange juice accident rather than it being anything software related.
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  • Updated to windows 10 and now my computer stays black when it goes into sleep mode

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    My iMac i7 quad was having the same symptoms with the blue screen and long startup times a couple of months ago.  Apple Care told me to bring it in to the local Apple Store, and after some diagnostics, the hard drive required replacing.  It took one day to replace the hard drive and my iMac is running great. I only had the iMac for about 12 months when the drive needed to be replaced.  Not sure if that is your Mac's problem, but it was for mine.

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  • G5 spontaneously goes into sleep mode

    Suddenly in the last couple of days my G5 has been spontaneously going into sleep mode. Sometimes within 5-10 seconds after "waking" it (which involves simply hitting the space bar) and several times in a row. It doesn't seem to matter what program is open or what I am doing.
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    Aug 9 15:28:41 MI6-2 kernel[0]: [14] "CPU A AD7417 AMB" Type:"temperature" Id:10 CUR:38.16384 C
    Aug 9 15:28:41 MI6-2 kernel[0]: [15] "CPU A AD7417 AD2" Type:"current" Id:12 CUR:4.46656 A
    Aug 9 15:28:41 MI6-2 kernel[0]: [16] "MLB MAX6690 AMB" Type:"temperature" Id:8 CUR:37.32768 C
    Aug 9 15:28:41 MI6-2 kernel[0]: [17] "SLOT 12V" Type:"power" Id:20480 CUR:0.0 W
    Aug 9 15:28:41 MI6-2 kernel[0]: [18] "SLOT 3.3V" Type:"power" Id:20992 CUR:0.0 W
    Aug 9 15:28:41 MI6-2 kernel[0]: [19] "SLOT 5V" Type:"power" Id:20736 CUR:0.0 W
    Aug 9 15:28:41 MI6-2 kernel[0]: USBF: 3044.623 AppleUSBOHCI[0x3809000] Processing WDH before suspending
    Aug 9 15:28:41 MI6-2 kernel[0]: IOUSBWorkLoop::closeGate - interrupt Thread being held off[20] "SLOT COMBINED" Type:"power" Id:21248 CUR:6.40345 W
    Aug 9 15:28:41 MI6-2 kernel[0]: IOHWCtrlLoops:
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    Aug 9 15:28:41 MI6-2 kernel[0]: [1] "Drive Bay Fan" Id:1 MetaState:0 "Normal"
    Aug 9 15:28:41 MI6-2 kernel[0]: [2] "CPU A Fans" Id:2 MetaState:0
    Aug 9 15:28:41 MI6-2 kernel[0]: [3] "CPU B Fans" Id:3 MetaState:0
    Aug 9 15:28:41 MI6-2 kernel[0]: [4] "U3/Backside Fan" Id:4 MetaState:0 "Normal"
    Aug 9 15:28:41 MI6-2 kernel[0]: [5] "PCI Slot Fan" Id:5 MetaState:0 "Normal"
    Aug 9 15:28:41 MI6-2 kernel[0]: ---------------------------------
    Aug 9 15:28:47 MI6-2 kernel[0]: System Sleep
    Aug 9 15:28:47 MI6-2 kernel[0]: System Wake
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