Here are suggested things to try if your printer is not connecting to your network after being in sleep mode:

1. Check if the printer is powered on.
2. Check that the printer is connected to the same network as you device.
3. Check that all cables a connected securely.
4. Restart your network router/modem.
5. Check if anyone else on the same network is having issues.
6. Run the printer's automatic setup feature.
7. Ensure that your printer drivers are up to date.