watchful watchful /ˈwɑːtʃfəl/

adjective

1. Engaged in or accustomed to close observation  ( watchful , alert )
   engaged in or accustomed to close observation
    Caught by a couple of alert cops
   caught by a couple of alert cops
    Alert enough to spot the opportunity when it came
   alert enough to spot the opportunity when it came
    Constantly alert and vigilant, like a sentinel on duty
   constantly alert and vigilant, like a sentinel on duty
   
2. Experiencing or accompanied by sleeplessness  ( insomniac , sleepless , watchful )
   experiencing or accompanied by sleeplessness
    Insomniac old people
   insomniac old people
    Insomniac nights
   insomniac nights
    Lay sleepless all night
   lay sleepless all night
    Twenty watchful, weary, tedious nights
   twenty watchful, weary, tedious nights