My previously good sleeper has started having difficulty going to bed, she wakes about a half hour after going to bed followed by 2-3 hours of going in and soothing her (pat, shush) to settle every 5-15 minutes before settling to bed for her long stretch of sleep which is then generally 4 hours now before waking to feed then its the same thing again of waking frequently every 20-30 minutes this time until getting up around 730. Her prior schedule was 8pm bed, 2 am feed, then 5 am feed sometimes or just sometimes needs settled back to bed 730 am wake up. Her naps and daytime activity have stayed consistent during all of this. She did just turn 5 months so I don't know if its something to do with her development. She's also teething and currently has a cold but these have been factors before without this much difficulty so I don't want to solely blame it on this and just keep going with it if there's something else I can be doing to help her. Suggestions?