Sleep and Obesity in Teenagers

Inclusion of 13 obese teens. Duration : 1 week of screening period + 1 week of intervention: habitual/extended sleep length + 1 week of intervention: extended/habitual sleep length. A wash out period of at least 3 months will be required between the two interventions.

Inclusion of 13 non obese healthy teen controls for measuring reference sleep duration and physiology level. Duration for these group: 1 week of screening period + 1 week of habitual sleep length

Inclusion criteria

• Male or female over 15 and under 18 year-old.
• Teenager with normal weight or stage 2 obesity, according to international standards (WHO)
• Post-pubescent teenagers (menstruation for girls and stage 4-5 of Tanner scale for boys)
• Teens with an social security
• Girl with negative urine pregnancy test

Exclusion criteria

• Active smoker (interview)
• Refuse consent (parents or teen)
• Addiction such as coffee, drug…(interview)
• Medicinal treatment that may influence sleep and measured variables (interview)
• Obesity diagnosis : less than 1 year (interview)
• Concomitant diseases : renal or hepatic failure, iron deficit, diabetes, endocrinal pathology, hypertension
• Anxiety (Spielberg>56), , depression (CDI>19).
• Mild or sever insomnia (ISI>15), poor sleep quality (PSQI >10), excessive sleepiness (Epworth>10, sleep) length>9 hour), extreme circadian typology (Horne et Ostberg from 70 to 86 or 16 to 30)
• Blood sample taken within the last two months before inclusion
• Mild or severe sleep apnoea or excessive leg movements according to EEG analysis