U1: reads "CB5121". Probably a PMIC
U4: Unmarked 32 pin IC is almost certainly the main microcontroller.
U3: BMA223 Accelerometer (used for detecting motion, for when the pillow should wag its tail)
U7: Unmarked 14 pin IC.
There is an unpopulated 6 pin header that looks like a serial port (UART)
There is an unpopulated 8 pin header that is probably for debug / flashing
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