"I can't sleep," says 70-year-old Christian Thurillat, who lives in a studio apartment in Paris and suffers, on top of record temperatures, from summer energy poverty -- a phenomenon that remains largely unaddressed and will worsen with global warming. On the sixth floor of a Haussmannian building, where he has been living since 2013, this former house painter is visited by a volunteer from the non-profit Petits frères des pauvres, Matthieu Mazo. IMAGES AND SOUNDBITES