Last couple of months noticed I was having quiet a few nights where I was having negligible deep sleep. We know that deep sleep benefits cardio vascular system and recharges our immune system. And I was not having alcohol so was worried what’s triggering that 
So I started noting down all I was eating and drinking post lunch. And could zero down on the culprit - Caffeine. I need to drink something with the ‘street food’ type meals and I was taking this cold coffee which had protein when ever they made Pav bhaji or similar food
Caffeine is a stimulate and we all know it keeps us awake and makes us alert. Caffeine has half life of 5-6 hours & quarter life of 10-12 hours which means half of the coffee consumed is circulating in brain 5-6 hours after you had it &quarter of that is circulating at..
.. midnight if u had it post 2 PM. Caffeine disturbs sleep quality. Caffeine decreases the amount of deep sleep. You will not remember struggling to fall asleep and u don’t remember waking up at night & you believe u had good sleep. But you don’t get restorative sleep.
If you are suffering from sleep issues check the ingredients of what you are eating. Many foods that we have,from energy drinks to some desserts to dark chocolate, has caffeine .If you are struggling with sleep at night, be mindful of the caffeine..
.. and other foods you are having during the day. Do an experiment. Keep off anything that has caffeine post 2 PM and check your sleep results. And if this subject excites you, read Why we sleep by Matt Walker. Amazing book and can open your doors to a good nights sleep.
And one thing which has always helped me solve problems is data digging. Most of the root causes to any problem can be found scientifically digging data and noting down things. It was simple to find the root cause of my bad sleep once I noted down what I was eating and doing.
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