जेरै मानसिआ उन्दुयो, मेलेमा लासैसिन नाथाय बांसिन आरो बांसिन दैथुनफोर दैथाय-हरो (इलेकत्रएनसेफालग्राफजों जाय बेखौ सुयोमोन)।
As a person sleeps, the brain sends slower but larger and larger waves (through the electroencephalograph which is used to measure it).