Usb music peripherals and mac sleep mode

I have a novation impulse keyboard and a scarlett 2i2 connected directly to my iMac via usb. They seems to stay awake even when the Mac's asleep.  Is this usual and, if so, do I have to disconnect them before putting Mac to sleep? If so, do I do this simply by pulling out the usb connectors because there are no desktop icons to eject?

I have a novation impulse keyboard and a scarlett 2i2 connected directly to my iMac via usb. They seems to stay awake even when the Mac's asleep.  Is this usual and, if so, do I have to disconnect them before putting Mac to sleep? If so, do I do this simply by pulling out the usb connectors because there are no desktop icons to eject?

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