Sleep will not stay asleep

I have a Mac Mini and when I put the machine to sleep, via the Menu sleep option, it goes to sleep and then wakes itself up about a minute later.
How can I get the Mac to stay asleep until I want it to wake?

It is possible that the "wakeup" is being caused by perceived activity on the connections to peripherals.
If you have a Bluetooth keyboard and/or mouse there is a possibility that they are sending periodic "messages" to the mini, or in a perverse logic some BT devices may send a message when they are about to go into sleep mode themselves (ie. "here's a disconnect request") which could well be about a minute after you've put the mini to sleep.
If you have any USB attached devices there is a similar possibility. In addition, I have noticed that USB cables that are near power cables pick up EM interference from power surges (eg. switching on a desk lamp) so you might want to check for the proximity of other cables.
Hope that helps.
Graham

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