You don't have to lie awake for hours past your bedtime to have insomnia. The condition can manifest itself in several ways.
Yes, you may have trouble falling asleep (sleep-onset insomnia), other people have problems staying asleep (sleep-maintaining insomnia) or waking up too early and can not fall asleep.
Sleep specialists may look for an underlying cause, such as a medical condition or psychological issue. Also, insomnia can be side effect of your life changes.