If an unconscious PC takes damage simultaneously—say, at the start or end of their turn—from two different sources, is that two failed death saves or just one, @JeremyECrawford @Dan_Dillon_1? I went with two last night, but this morning wondered whether the simultaneity matters. Each individual source of damage causes a failed death saving throw.

For example, if the dying creature is in the area of both a spirit guardians and cloud of daggers spells, that's 2 failed death saves, 1 from each, at start of their turn.

— Dan Dillon (@Dan_Dillon_1) June 25, 2020