It's hard to raise a family and juggle the other aspects of everything. Try to veer away from the devious schedule from time-to-time. Instead of your routine dinner plan - have a picnic or go out to eat. Instead of staying in during the weekend - go out! Be adventurous and steer away from the norm. Adding spontaneity to your life will help to keep the spark alive.
Surprise your spouse and get a baby sitter and do something fun.