Regulating
your baby's sleep patterns and teaching him/her healthy sleep habits, with her
brain still developing and along with it his/her sleep-wake cycle, will require
being consistent with your strategy to guarantee results: 

1. Set a clear daily routine: make sure that you keep your
   baby's daily routine consistent, this will help make bedtime without
   conflict. So the plan is to set a specific time for the following
   activities and stick to it every day: napping, eating, playing, and going
   to bed. You may want to have her play shortly before bedtime; as such, she’d
   be exhausted by the time when she should sleep and will fall asleep
   without a struggle.

2. Make her feel the liveliness of human activity during
   the day, and calmness and quiet at night. This will help your baby develop
   her inner clock and realize the difference between day and night.

3. A simple and not too long (no longer than 45 minutes) bedtime
   routine, like a warm bath, a nappy change and then into her night clothes.
   A tummy massage, a lullaby or story etc. These should be done in the
   bedroom where your baby sleeps. Keep that bedroom warm and pleasant. This
   routine should last no longer than 45 minutes. A good baby bedtime is
   usually between 8.30pm to 9pm; if you wait till after that, she's likely
   to get overtired and fussy which will make falling asleep a hassle.

4. It’s OK if your baby cried out for a bit – not for too
   long though, but DO NOT leave her alone to cry for as long it takes before
   falling asleep. So what you need to do is put your baby in the crib and if
   she cries, go to her, pat her gently and tell her everything's fine, but
   it's time for sleep. Be gentle, but firm. Leave the room. Wait for a set
   interval, anything from two to five minutes, then check again. Do this
   repeatedly until she falls asleep, extending the time between each visit.

5. Have your husband help you in providing comfort to your
   baby: hold and cuddle her

If
you still have questions or concerns about the subject, here is a good link
with useful and practical tips on regulating babies’ sleep between 4-6 months
of age: http://www.babycenter.in/a7656/establishing-good-sleep-habits-three-to-six-months">http://www.babycenter.in/a7656/establishing-good-sleep-habits-three-to-six-months</a>