This study is to determine the impact of night shift nurse's activity on patients' sleeping patterns in medical services including individual, clinical and environmental factors. The patients will be questioned in order to create both a control group and a group with troubled sleeping patterns.

There are 5 speciality medical units involved. Patients must respond to the define inclusion criteria. Each patient will be asked if they agree to participate and if so will be asked to consent to participate.

Every day, nurses will give a questionnaire which will be completed by the patient to know if there were troubles sleeping patterns. If so, a second questionnaire will be completed by the patient.

Other data will be recorded such as personal informations, diagnostic, medical history, consumption habits and treatments.

The inclusion phase lasts 15 days maximum.

Inclusion Criteria:

• Patient hospitalize in medical units
• In the unit since one night
• Patient over 18 years old
• Patient agree to participate

Exclusion Criteria:

• Patient who can't answer to the questionnaire for health reasons
• Patient who need a specific surveillance
• Patient recently operated

Patients hospitalized in a speciality medical units and who respond to the defined inclusion criteria. 5 units participate: nephrologye, neurology, cardiology, pneumology, endocrinology.