[Unit]
Description=Custom Sleep Actions
Before=sleep.target
StopWhenUnneeded=yes
RequiresMountsFor=/home/

[Service]
User=<fill-this-in-with-your-username>
Type=oneshot
RemainAfterExit=yes
Environment=DISPLAY=:0
ExecStart=/home/foo/bin/tasks.on.suspend
ExecStop=/home/foo/bin/tasks.on.resume

[Install]
WantedBy=sleep.target