Heating sony xperia

Check the charges, the charger cable, its connectors and the connector on the phone. Everything should be clean and shiny. Not a speck of dust is allowed in any of the connectors. Use pressured air (in a can) to blow dust or a piece of paper out any contact. Never use sharp or metallic tools to pul out debris.
Perhaps you should also borrow a charger from someone else, to exclude the charger as cause of the problem.
If it is the phone, don't try to repair this yourself, if you don't have the skills.

my arc s had the same problem when using the internet for long periods. its never caused any problems but if its running really slowcheck which apps you have running and shut down the ones which arent important, and update your operating system to the patest version. my battery used to last round 8 hrs now well over a day. i make sure i only run the apps im using, keep my display brifhtness low and only connect to the internet when using it, this should improve your battery life no end. it will still get hot if your using it for long periods, its no danger but you can place a playing card inside against the battery which will help reduce the heat you actually feel. hope this helps much love CHRISPY

There is a solution by Sony for this problem.
Just follow the instructions: http://talk.sonymobile.com/t5/Xperia-miro-Xperia-tipo-tipo/TIPO-TOUCHSCREEN-FIX-PATCH-HERE/td-p/262920

turn phone off,take battery out and let it cool off like 5 minutes then put it back together and calibrate it and everything thing will be good

For touch problems you can try to do touch panel calibration:
http://talk.sonymobile.com/t5/Xperia-J/Touch-screen-issue-in-Sony-Xperia-J/td-p/287066

The phone may still be damp inside. Try using a blow dryer to finish drying up the moisture in your phone.

If you're still having touch-screen problems with your Tipo, you might need the screen calibration patch.
Download this file:
http://www.4shared.com/rar/3p6YulVl/ST21i_calibrate.html
The file is the official screen calibration patch from Sony for issues with the touchscreen of the 2012 range phones (I'm 100% sure it works on: Tipo, Tipo Dual, Miro and Xperia J)

Sony Xperia x comes with Android OS, v6.0.1 (Marshmallow), Qualcomm Snapdragon 650 SoC, Quad-core 1.5 GHz Cortex-A53 & Quad-core 1.7 GHz Cortex-A57, Adreno 510 Processor, IPS LCD Capacitive touch screen 16 million colors, multi touch up to 10 fingers with Scratch-resistant glass, Shatter proof glass, Triluminos display, X-Reality Engine, IP58 certified - dust and water proof, Water resistant over 1 meter and 30 Minutes, 5 Inches 1920 x 1280 pixels, 32GB Storage, 3GB RAM ans expendable up to 256 GB via microSD Card, 23 MP, 5520 ? 4041 pixels, autofocus, LED flash, 1/2.3 sensor size, ISO 12,800, geo-tagging, touch focus, face detection, image stabilization, HDR, panorama Back & 13 MP, f/2.0, 22mm, 1/3" sensor size, 1080p, HDR Front camera, Sony Xperia x Performance EDGE, GPRS, GPS, Wi Fi, 3G and 4G Android Smartphone by Sony. Sony Xperia Performance Saudi Arabia Price of Smartphone amp Specifications

Chances are your phone got too hot during the night and overcharged the Lithium Ion battery. If those batteries are exposed to too much heat then they won't have the battery life they used to have. You need to purchase a replacement battery or contact your wireless carrier to see about getting another one.