One of those "Twin" things

Generally, the boys sleep on their tummies and are in a different spot in their crib about every time I check on them. However, in the last few weeks on about five occasions now both boys will be laying in the exact same spot, in the same position within their cribs....So weird! One night I went in both were laying in the middle of the crib laying the short way in their cribs. Last night both were wrapped around the corner.