You need the -benchmem flag to get a report of allocations:
$ go test -bench=. -benchmem
goos: darwin
goarch: amd64
BenchmarkTestSleep_2000-4 1 2005447537 ns/op 456 B/op
3 allocs/op
BenchmarkTestSleep_1000-4 1 1001627153 ns/op 64 B/op
1 allocs/op
BenchmarkTestSleep_500-4 2 500908757 ns/op 36 B/op
1 allocs/op
BenchmarkTestSleep_100-4 10 101720516 ns/op 6 B/op
0 allocs/op
BenchmarkTestSleep_10-4 100 12494871 ns/op 0 B/op
0 allocs/op
PASS
ok _/tmp 6.911s
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