مختصر صحيح بخاري
Mukhtasar Sahih Bukhari
Book of Prayer Times
Sleeping before Isha if overcome by sleep
`Sayyiduna Ibn Abbas (may Allah be pleased with them both) narrates that when the Prophet Muhammad (peace and blessings be upon him) placed his hand on his head, he separated his fingers a little and placed the tips of his fingers on one side of his head. Then, joining them together, he drew them across his head in such a way that his thumb reached his earlobe, near the edge of his beard by his face. He neither delayed nor hurried; he did exactly as I have described to you.