Instant WBTB?

Lately, I haven't been sleeping well or right. I don't get sleepy until about 2 in the morning, and can only sleep to around 9, I don't even bother getting up, I go back to sleep until around 11ish. I often have DILD's in this period, wouldn't this be too short to be a WBTB?

I like to goto bed around 9:00-10:00PM and wake up around 2:30-3:00AM in the morning. I usually stay up for only 20:00-25:00 minutes doing reality checks and playing around on DreamViews.com for a while and then go back to bed.