Hi Chris,
You've to specify what plants you have. You know, every crop has its own specific insect pests and diseases. Not unless you'll tell me what plant you've planted, we'll be hard-up in giving you the solution.
Generally, some worms that attacks during night time are called nocturnals, meaning they're active during the night. You can spray them with a systemic insecticides before sundown or before your night sleep.
But, as I've said, identify your plant first so that appropriate control measures can be initiated.
Happy gardening!
Cris
www.crisramasasa.com