Showing varying behavior of sleep & afterfunc across system suspends depending on presence of Ticker

sleeptimers.go

package main
import(
  "time"
  "log"
  "sync"
)
func main() {

var wg sync.WaitGroup
wg.Add(2)

  start := time.Now()
  start0 := start.Round(0)
  log.Println("START")
  log.Printf("%#v", start)

  _ = time.NewTicker(time.Second)
/*
  go func() {
    ticks := 0
    for {
      <-t.C
      ticks++
      log.Println("TICKS",ticks)
    }
  }()
  */
  go func() {
    time.Sleep(30 * time.Second)
    gstop := time.Now()
    log.Println("GO SLEEP", gstop.Sub(start), gstop.Round(0).Sub(start0))
    log.Printf("%#v %+v", time.Now(), time.Now().Round(0))

    wg.Done()
  }()

  time.AfterFunc(30 * time.Second, func() {
    gstop := time.Now()
    log.Println("AFTERFUNC", gstop.Sub(start), gstop.Round(0).Sub(start0))
        log.Printf("%#v %+v", time.Now(), time.Now().Round(0))

    wg.Done()
  })

  wg.Wait()
}