It's never "healthy" to rely on Benzo's for sleep. Just as it's never healthy to rely on alcohol for sleep either. Benzo's can be an effective short term solution for insomnia, anxiety and panic attacks. But be warned, just like Alcohol, physical dependency can build very quickly to Benzo's, then before you know it, you're dealing with the rebound effects which are quite often many times worse than the initial systems the Benzo was used to treat.
It's also important to note that there's a big difference between quality of sleep and quantity of sleep. Clonazepam can easily knock a person out for a good 8-12 hours at a high enough dose if they have no previous tolerance to the drug or cross tolerance with other Benzo's or Alcohol. However much of this is what's known as "dead sleep". This is where you're kept in a low level sleeping state for an extended period of time and the duration of quality REM sleep is greatly shortened.
Using it as an occasional one off if you really must get to sleep for a certain time is "ok". But it's not something you want to make a regular habit out of due to the quick onset of physical dependency.
If it's your first time taking a benzodiazepine, I'd recommend taking no more that 0.5mgs (quarter of that tablet) as your first dose to see how you respond. The balance is to take just enough to help you fall asleep with a little effort, but not so much that it knocks you out cold without even attempting to get to sleep.