<qa>  What is the name of the protocol to define subtype stroke and parenchymatous andMEASUREMENTS: protocol to define subtype stroke and parenchymatous and vascular location; sleep questionnaire including Epworth Sleepiness Scale; Respiratory Polysomnography RPSG. If RPSG shows an AHI 20, with predominant obstructive events, patients will be randomized in a CONTROL GROUP conventional treatment and a TREATMENT GROUP with Nasal CPAP. Follow up for both groups at 1, 3, 12 and 24 months will include: early neurological outcome, body mass index BMI, blood pressure BP, functional recovery Barthel IndexCanadian Scale, quality of life SF36, recurrences, vital status. Nasal CPAP titration will be performed by means of an automatic system Autoset Portable ST. Compliance will be recorded. If a negative RPSG is obtained AHI 10 NO SAS GROUP or with AHI 20 mild SAS the usual treatment and the same follow up protocol will be established. 