If I may add something to this discussion, if this is a PC I strongly suggest disabling sleep. Make sure the computer gets completely shut down every now and then. Sleep can add unneeded problems for you.
Sorry Henry, but I disagree.
Years ago, with XP maybe but modern versions of Windows deal with the various sleep modes just fine - and this is especially true with current hardware which is specifically designed to support various sleep modes using modern versions of Windows.
The ATX Form Factor standard, for example, which has been around for years, requires all ATX compliant PSUs provide +5Vsb standby voltage to multiple points (including the RAM) on the motherboard when in standby mode. That is, any time the PSU is plugged in, and if so equipped, the master power switch on the back of the PSU is set to on. This standby voltage is what keeps your USB ports alive so you can press a key or wiggle your mouse to wake the computer when in sleep mode. DDR4 RAM is specifically designed to operate in a low voltage state to maintain data during sleep. Modern motherboards that support DDR4 are designed to take advantage of those modes so modern versions of Windows can wake faster, allowing users to much more quickly resume where they left off. A very good thing! And it works!
If you have a PC, I highly recommend using hybrid sleep mode (which is enabled by default on PCs). Hybrid sleep mode is combination of sleep and hibernate. In Hybrid sleep, the system saves any open documents and programs in memory running in a low voltage state, and it saves that data on the system disk too. Windows then suspends the computer into a low-power state, restoring the data upon waking.
However, should a power outage occur during that low voltage sleep mode, Windows will restore the last session using the hibernation data previously saved on the disk - with no data loss!
Note that Hybrid mode is not intended for notebooks and is disabled by default on notebooks. This is because on PCs, that +5Vsb voltage is still be applied in the various stand-by and sleep modes, therefore some power, while small, is still being consumed. That is not desired with battery operated devices.
If unneeded problems do occur, the proper solution is to find out what is causing those problems, and fix them!
Also, again while maybe true with XP, it is no longer true with modern versions of Windows (W7, W8, W10) that they need to be shutdown regularly. Just let them go to sleep. I only shutdown or reboot when some Windows or security update forces a reboot. That means I might go for weeks without shutting down my computers!
Contrary to what some may want us to believe, modern versions of Windows are very capable of properly managing its resources. There is no need to regularly reset everything with a reboot or shutdown and boot.
Disabling sleep (keeping computers fully awake) is just a waste of energy. And a full shutdown with power off can stop Windows from its normal housekeeping tasks it has scheduled while "we" sleep like indexing, defragging hard drives, and most importantly, installing critical updates.
If you want to regularly shut down your computer, that's fine. But understand Windows may then be forced to do more housekeeping and updating when you are using it - which can degrade performance, not optimize it.