This study is designed as cross-over double-blind placebo-controlled randomized clinical trial that 40 diabetic patients with sleep disorder with the inclusion criteria will enter into the study and randomly assign to first intervention and first placebo groups.The primary outcomes are change in sleep disorder and metabolic parameters that will be evaluated at the end of the study.

Considering the high prevalence of sleep disturbance in diabetic patients and the effectiveness of lavender in treatment of sleep disorders in this study the efficacy of Lavender aromatherapy in sleep disorder and metabolic parameters in diabetic patients will be investigated. This study is designed as cross-over double-blind placebo-controlled randomized clinical trial that 40 diabetic patients with sleep disorder with the inclusion criteria will enter into the study and randomly assign to first intervention and first placebo groups.The primary outcomes are change in sleep disorder and metabolic parameters that will be evaluated at the end of the study.

Inclusion Criteria:

• Diabetes mellitus type 2
• Age between 25-65 years old
• Fasting Blood Sugar between 70-130
• 2 hour post prandial glucose less than 180.
• HbA1C less than 7
• Sleep disorder according to pittsburgh Insomnia Rating Scale more than 5.

Exclusion Criteria:

• Any systemic illnesses
• Use of sedative or antidepressant drugs
• Pregnancy
• Lactation
• History of allergic reaction to Lavender
• History of allergic rhinitis, asthma and respiratory disorders
• Anosmia
• Headache that start with smell
• Cigarette smocking or substance abuse
• Hospitalization or surgery within 1 months ago.
• Work shift

Lavender Essential oil as medication and almond oil as placebo put in similar dark buttle and the head of placebo bottle aromatized whit Lavender Essential oil and all of participants, care provider, investigator and outcomes assessor will be blind.