I recently was prescribed a cpap machine that tracks how much time I sleep. I work 2nd shift and go to bed 1am. My sleep is often cut short by early morning obligations. Most days my thyroid is fine my afternoon temp is 98.5, other days I feel sluggish my temp will be 97.0. I found an interesting study about the effects on sleep and thyroid on the on the NIH website.

Changes in Serum TSH and Free T4 during Human Sleep Restriction

Intervention:
Randomized exposure to 14 days of sedentary living with ad libitum food intake and 5.5- vs. 8.5-h overnight sleep opportunity.

Measurements and Results:
Serum thyroid-stimulating hormone (TSH) and free thyroxine (T4) were measured at the end of each intervention. Partial sleep restriction was accompanied by a modest but statistically significant reduction in TSH and free T4, seen mainly in the female participants of the study.