fix sleep: wait for at least 1ms #808

Job	Run time
check	2m 10s
build	2m 57s
bench	2m 20s
doc	1m 11s
test-sim (ubuntu-latest, stable)	4m 25s
test-std (ubuntu-latest, stable)	4m 18s
test-sim (ubuntu-latest, nightly)	4m 18s
test-std (ubuntu-latest, nightly)	4m 14s
test-sim (macos-latest, stable)	13m 18s
test-std (macos-latest, stable)	5m 46s
test-sim (macos-latest, nightly)	5m 59s
test-std (macos-latest, nightly)	5m 5s
	56m 1s

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