Individual Differences in Diabetes Risk: Role of Sleep Disturbances
Individual Differences in Diabetes Risk: Role of Sleep Disturbances
The hypothesis for this study is that some individuals may be at much higher risk to develop
 type 2 diabetes and that the individual diabetes risk will be predicted by the individual
 level of slow wave sleep activity (SWA).
Inclusion Criteria:

 -  Healthy men and women with low Slow Wave Sleep Activity (SWA) or high SWA with the
 gender distribution in each group matching the gender distribution of active duty Army
 personnel (85% men; 15% women) based on the following inclusion criteria:

 -  age 18 to 29 years,

 -  normal weight or modestly overweight (BMI ≤ 27 kg/m2 for women, BMI ≤ 28 kg/m2
 for men),

 -  normal findings on clinical examination, normal routine laboratory tests results,
 normal EKG, no history of psychiatric, endocrine, cardiac or sleep disorders.

 -  Only subjects who have regular life styles (no shift work, no travel across time zone
 during the past 4 weeks), habitual bedtimes between 7.0-8.5 hours, and do not take
 medications will be recruited.

 -  An overnight polysomnography will be performed to rule out sleep-disordered breathing
 (apnea-hypopnea index > 5/hour) and periodic limb movement disorder (PLM arousal index
 >1/hour).

 -  Women taking hormonal contraceptive therapy and pregnant women will be excluded. In
 women, all studies will be initiated in the early follicular phase.

 Exclusion Criteria:

 -  Tobacco use.

 -  Habitual alcohol use of more than 2 1 drink per day.

 -  Excessive caffeine intake of more than 300 mg per day and individuals with a metal
 implant or another metal object in their body.

 We estimate that we will need to recruit at least 60-70 individuals to obtain two
 gender-matched groups of 16 individuals with either low or high SWA.