A great way to deal with the different modes is to establish habits and routines around each of them. My friend is head of design at Salesforce and turned me on to the concept of "Me, Make, Meet":

http://managinguxteams.com/2010/03/27/me-make-meet-how-to-ma...

Tldr - use your calendar to carve out concrete "me time" to reflect, cave time at the beginning of the day to make stuff when your energy is highest, and set aside meetings and office hours for the end of the day.