Usually at 5AM, but I never start those "usual" boxes before 7AM nor gathering to work before 7AM. This two hours are for the most important things: either sleep if I feel like I need some or making my research which I consider the most important thing I do in my life.

Actually a summer makes early waking up easier because of the bright sun lighting into my bedroom, but a winter makes easier early going to bed because of lack of light and because I have moved from a city which are famous by actively throwing out orange Sodium lamps in the favour of blue LEDs nowadays. Blue light is my personal enemy of my productivity.