You might have more luck if you time your attempt a little later. About half of our dreams occur in the last 2 hours of sleep, and we generally enter REM sleep more quickly the more sleep we have had. If you normally get to sleep at 12.30, try waking up at around 5.30 or 6.00 instead. Regarding yoru problem of struggling to go back to sleep, it might help if you can minimize any activity that would make you too alert. E.g., avoid turning on the light or moving around too much.

Other than that, I think you'll need to be more specific if you want more help. For example, What (specifically) happens when you try to do WILD? Also, what technique/s are you doing? There are many ways to perform WILD. Try having a look around on these forums if you haven't already - there's a huge amount of information here about WILD. Also keep in mind that although virtually anyone can learn to have lucid dreams, it generally does take dedication and patience.