Is your Mac won’t go to or stay in sleep? Are you getting worried and tensed due to this troublesome issue? Then, browse this guide briefly to fix this issue in simple steps. If your Mac wakes up unexpectedly, you might require to change Mac OS sleep preferences. If it does not work, something may be waking your Mac. Well, If your Mac won’t go to sleep or stay in sleep then first of you all you have figure out the actual behind this annoying problem. So, to check what's causing the problem Launch Terminal that is located in the Utilities folder, which itself is in the Applications folder on your Mac’s hard drive. Once launched, type the following command .i.e pmset -g assertions. The 1st list of output will display you the status of PreventSystemSleep and PreventUserIdleSystemsSleep, if one of them is displayed to have a status of number 1, it suggests that, it is presently activated which is keeping your system awake. The 2nd part displays which series of action own the assertions which are enabled, so check down there to see what’s keeping your Mac up. If you don’t figure out at first what process is being named, you can also launch Activity Monitor, also in the Utilities folder, and visually see what process is being named. However, if still Mac won’t go to or stay in sleep then we recommend you to opt for a reliable third party tool .i.e Mac Data Recovery Software to fix this issue. It has advanced scanning algorithm which will find out and rectify Mac won’t go to or stay in sleep issue. Moreover, it fixes all types of Mac related errors and gets back permanently deleted or inaccessible Mac files.