As a consequence of PD I also have Orthostatic hypotension (low Blood Pressure on standing up) so combine that with hot weather, which lowers one's BP anyway, and then the fun can really start! - Sun loungers are strictly out of bounds!
Miserable symptom! My worst response to it is now, are winters are quite cold. Made worst by living in a building with intermittent heating issues, but cheap. There's also no ability to alter the heat, on or off is what we got. Getting into bed is known to cause me to nearly seize up. Cheers Ian