This study will have a single arm: the patient on NPH will continue his treatment for 4 weeks, at the end of the NPH treatment, the patient will receive his CGM device for three days for glycemic holter, a switch to insulin glargine is started for a period of 12 weeks with a dose adjustment and a control of the glycemic balance by CGM for three days at the end of the study.

The NPH insulin vial is a 10 ml vial dosed at 100 IU/mL, The Glargen vial is in the form of a solution for injection, a 3 ml vial dosed at 100 IU/mL

Follow-up visits will include :

• V0: - 4 weeks: Screening visit (before the start of treatment): patients will be selected at this initial visit, if they meet all the inclusion criteria and none of the non-inclusion criteria, the patient will receive the glucometer. The patient presents himself to do his initial assessment (including HbA1c) and sign the consent, to do his therapeutic education and to receive the nutrition booklet
• V1: -3 weeks: the patient will be contacted by the ARC (phone call) to communicate the results of the glycemic cycle already performed and for titration of his NPH, continue with the new dose until the monitoring stops
• V2: inclusion visit: D0: 4 weeks later, the patient will receive his CGM. A glycemic cycle will be done and communicated to the ARC.
• V3: Visit of 4 weeks + 07 days: the day the patient presents himself to put the CGM device back on (stop monitoring) and collect data (glycemic holter under NPH) and switch to insulin glargine.
• V4 + V5: respectively at 2 and 3 weeks after switching to insulin glargine, the CRA contacts the patient by phone to record the results of the glycemic cycle and thus adapt the dose of insulin glargine upwards or downwards as needed (titration). The patient will do a glycemic cycle and communicate it to their ARC. Continue with the new dose until the next V6 titration
• V6: at 6 weeks after switching to insulin glargine, the patient will attend the consultation (face-to-face) to communicate the results of the corresponding glycemic cycle and thus adapt the dose of insulin glargine upwards or downwards as needed (titration). Continue with the new dose until monitoring is stopped
• V7: 12 weeks after starting glargine, the patient presents again for placement of the CGM device (start of monitoring). The patient will also do a glycemic cycle at the same time and communicate it to his ARC. A laboratory assessment (including glycated hemoglobin) will be requested.
• V8: 12 weeks + 7 days stop CGM monitoring (collection of holter results under glargine) and end of the study.

Inclusion Criteria:

• Age≥ 18 and <70
• Type 2 diabetic patients, with a duration of NPH between 5 and 10 years.
• Patients treated with a double dose of NPH insulin with a stable dose of insulin and a stable dose of ADO (oral antidiabetic drugs) for at least 2 months prior to the start of the study.
• An HbA1c level between 7% and 10%
• Ability to use a continuous glucose monitoring (CGM) system and cycle blood glucose with the meter.
• Written informed consent obtained prior to participation in the study.

Exclusion Criteria:

• Pregnant and breastfeeding women
• Patients with active proliferative and/or complicated diabetic retinopathy, treated by photocoagulation or surgically, within 6 months prior to study entry or any other rapidly progressing unstable retinopathy that may require photocoagulation or surgery during the study (plan to perform fundus prior to inclusion).
• History of insulin glargine hypersensitivity
• Treatment with systemic, neuroleptic, immunosuppressive and antiretroviral corticosteroids within 3 months prior to study entry and during the study and other treatments, which may significantly affect blood glucose.
• Severe renal impairment at baseline defined by a < 30ml/min.
• Patients on sulfonylurea drugs or glinides or on more than three oral antidiabetic drugs (ODAs)
• Patients on rapid insulin.
• Patients Enrolled in Other Clinical Studies
• Patients who refuse to sign consent.