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Someone put up a tent on their balcony to escape their heat-trapping apartment during the night.
(discuss.tchncs.de)
Third extended heat wave within 6 weeks.
The previous one exceeded 40°C, and the buildings not yet had time to completely cool down from that one before the third wave hit.
I was considering putting up a tent in my garden myself, but as I own a ground floor flat, the indoor temperatures did, with the help of some additional cooling measures, thankfully not exceeded 27°C.
I sometimes do sleep in a tent outside in the garden (Not out of heat reasons yet, but because of fun events with the kids).
I wouldn't worry about being woken up by the sun, as what will actually wake you is not the sun, but the relentlessly enthusiastic birds chirping away at the top of their lungs almost an hour before sunrise already ;-)
I used to keep a loaded nerf pistol with me for this exact reason.
Seems useless, you'd need to be awake to take the shot.
I recommend an automatic "Bird Banger" to scare them away periodically.
I doubt the birds would wake me. I sleep with my window open anyway so I'm used to them.