Best time to hit abs?

I do weight training 4 days a week

2 days a week i do HIIT Cardio for 37 minutes



I workout in the evening 6 to 7:30pm



Sometimes due to sleeplessness due to Pre workout, I feel like hitting abs intensely at night.

Is it fine? As I wake up late in the morning usually after 9-10 hours of sleep and down a protein shake immdly after waking up



Age 22

bf~10

natty

Best time to hit abs?