If you want to get a quick view of recent boots and resumes-from-sleep dates (on a systemd system), you can use this:

#!/bin/bash
echo -e "\e[34mBoots:\e[39m"
journalctl --list-boots | tail -5
echo -e "\e[34mSleep Resumes:\e[39m"
journalctl -t systemd-sleep | grep resume | tail -5