Response to Sara, Re: Sensory Depravation

Sara brought up sensory depravation and how it can distort one's perception of time in her blog. I have done a little bit of research on this topic but have not found much information (there's a lot about sensory deprivation but not much on its effect on perception of time). In my last post I spoke about how our bodies have their own sense of time. If we have a "biological clock", then why would we need sensory stimulation to sense time? Our 24-hour day is roughly based on the human body's 25 hour cycle. So, does sensory deprivation disrupt one's inner circadian rhythm? Or is it something else? Does time feel longer than it actually is after experiencing sleep deprivation the same way doing a boring task seems to take forever?