One Player Sleeping [1.13 - Vanilla]

=== SETUP ===
/scoreboard objectives add sleeping minecraft.custom:minecraft.sleep_in_bed 1
/scoreboard players add @a sleeping 0

=== DETECTION ===
/execute as @a[scores={sleeping=1}] run setblock X Y Z redstone_block

=== RESET ===
/scoreboard players set @a sleeping 0
/time set 0
/setblock ~ ~1 ~ air
====================
Please watch my video for more information on setup
~Happy