There are many reasons for the tired parents falling asleep and not paying attention to their child's sleep, sleeping with grandparents with varying degrees of bed rest, etc. Remember that intermittent positive reinforcement is one of the most powerful forms of conditioning.

If there's a lot of commotion at night and you lull your child to hold it in, you will only confirm his excitement.You have to prepare yourself  well in advance for baby sleep training. You shouldn't start until you're ready. Avoid starting it before going on vacation or staying guests.

Most babies don't need extra calories at night after 6-9 months of age. If you don't realize this and feed your child several times a night, you will soon run into trouble. It is best to stop eating gradually in the evening at this time.

Sometimes there are sleep problems due to medical reasons and deficiencies, which can be a big mistake. In other words, it could be asthma, anxiety, restless leg syndrome, or obstructive sleep apnea that is interfering with your child's sleep. 

Babies are unlikely to respond to changes in behavior. It's important to address non-behavioral sleep problems first, as they can be serious. It is also a good idea to consult with your pediatrician about this matter first before you even think about starting sleep training.

All these deviations interfere with proper sleep training and you should be aware of them. Otherwise, the only time you'll have serious sleep problems is when training your baby.