How long is it OK to let a laptop sleep by closing lid. I used to let it sleep during day when not using it but found when I go to shut down at night it is installing updates and says not to turn it off. So I began to leave it in sleep mode all night. But now unsure when to shut down or for how long. I like to have it sleep in day when not using but do not need it all night. Anyone else have this issue or a solution? Thanks.