Mouse and Keyboard not responding after sleep

Ok so, this is really bothering me, and as far as I can see, this issue goes a long way back. Every time my Mac goes to sleep (for a period longer than 10 minutes), my peripherals lose connection and I cannot revive them unless I force restart. Keyboard does work if I plug the lightning cable, so I manage to sudo restart the machine from terminal because mouse will not work no matter what I try. Seems like my Bluetooth shuts down completely.

Can anyone help me with a solution? It's really frustrating to restart it so much.

• iMac (Retina 5K, 27-inch, 2017)
• macOS High Sierra 10.13.3
• Magic Keyboard 2 + Magic Mouse 2