Charging your phone on airplane mode by disconnecting it from mobile network, Wi-fi and Bluetooth will ensure a fast recharge of your phone.
Moreover, it has a double advantage as it recharges faster and saves the energy otherwise required by the apps that run in the background of your phone and use data connection (such as Facebook, WhatsApp and Instagram above all). This way you prevent your battery from wasting its energy during the charge.
In addition, radiation emanating from our smartphones when left charging during night can cause nightmares and even prevent us from falling asleep or interrupt our sleep during night. The reason? An alteration in the self-regulation system of some processes, such as in case of our biological clock or circadian rhythms.