Yeah, if you not sleepy, that may not be a good time to try.

Try after shorter sleep - 4.5hrs or so at night. You should still be sleepy enough. And if you normally don't take naps and you can't fall asleep, then naps may not be for you. Sorry, because naps are really good time for lucids. maybe try when physically tired from some activity.

If this doesn't work, try to go with a DILD. You don't need to WBTB for that. And practicing for DILD will help you with WILDs and also non-lucids.