Oh man...I think I just figured out what the clicking sound was...the occillating fan beside Debbie's bed. If it fell over while still on occillate...click click click...
Cadaver dog hit at the foot of the bed...fan at the foot of the bed.
Lawyer pointed out that although rumor was that cadaver dog hit on foot of bed, carpet/evidence was not collected. Luminol evidence works better after about six weeks, so although a cadaver dog hit on the foot of the bed (which is a bit weird ... dead child at the foot of the bed between 10:30 and 4 AM?), maybe the idea is to look for luminol revealed evidence of blood. Still, no carpet taken from the area where the dogs were rumored to have given an alert.