That which the Machaber writes in the first siman of Shulchan Aruch: יתגבר כארי לעמוד בבוקר לעבודת בוראו, שיהא הוא מעורר השחר From here could one say that if one doesn't get up by alos hashachar ...
Can someone please explain the halachot for someone who wakes up after zman kriat shema? After zman tfillah?
I recently read an article on polyphasic sleep and I'm quite interested in experimenting with it. The article advises the Uberman approach which advocates 20-30 minute naps every four hours, meaning ...