Dreams occur in REM sleep, so if you were behind in REM, the brain will play Catch Up. It's normal not to remember dreams, so I wouldn't be concerned. Most OTC sleep aids and alcohol will put you in Stage 1&2, but disturb REM.
The National Sleep Foundation found that caffeine disturbs sleep up to 22.5 hours later on an EEG. So watch the coffee, tea, chocolate. Nicotine can disturb sleep.
A heavy meal late at night can disturb sleep. Eat earlier and a lighter meal. Think salads and veggies, pass on the heavy meats and oily foods. Let us know what happens.
Depression (serotonin deficiency) can cause insomnia. Turkey, cashews, bananas and milk are great natural sources of tryptophan (an amino acid (broken down protien)).
Tryptophan -> 5HTP (brain) -> serotonin (brain) -> melatonin (pineal gland) [the sleep hormone].