This support page has the instructions for enabling deep sleep:
Support for WeMos D1 ESP-Wroom-02 Nodemcu
edit by Guy: in short, solder/connect pins as shown circled in red:
This support page has the instructions for enabling deep sleep:
Support for WeMos D1 ESP-Wroom-02 Nodemcu
edit by Guy: in short, solder/connect pins as shown circled in red: