The example code on in the Docs does not work with the current library (1.0.5). The following code does not error but never wakes up. LoPy starts blue flashing when it is meant to be asleep.

code [Code tags added by @administrators]

import deepsleep

ds = deepsleep.DeepSleep()

# get the wake reason and the value of the pins during wake up
wake_s = ds.get_wake_status()
print(wake_s)

if wake_s['wake'] == deepsleep.PIN_WAKE:
    print("Pin wake up")
elif wake_s['wake'] == deepsleep.TIMER_WAKE:
    print("Timer wake up")
else:  # deepsleep.POWER_ON_WAKE:
    print("Power ON reset")

ds.enable_pullups('P17')  # can also do ds.enable_pullups(['P17', 'P18'])
ds.enable_wake_on_fall('P17') # can also do ds.enable_wake_on_fall(['P17', 'P18'])

ds.go_to_sleep(10)  # go to sleep for 60 seconds 

Result

Uploading project (main folder)...
Reading file status
[1/1] Writing file main.py
Upload done, resetting board...
ets Jun  8 2016 00:22:57

rst:0x7 (TG0WDT_SYS_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:1
load:0x3fff8028,len:8
load:0x3fff8030,len:1728
load:0x4009fa00,len:0
load:0x4009fa00,len:14584
entry 0x400a059c
Booting...
Telnet server started
{'P10': 0, 'wake': 0, 'P18': 0, 'P17': 0}
Pin wake up
Traceback (most recent call last):
  File "main.py", line 42, in <module>
  File "/flash/lib/deepsleep.py", line 182, in go_to_sleep
  File "/flash/lib/deepsleep.py", line 75, in poke
  File "/flash/lib/deepsleep.py", line 48, in _magic
KeyboardInterrupt:
Pycom MicroPython 1.18.0 [v1.8.6-849-046b350] on 2018-06-01; LoPy with ESP32
Type "help()" for more information.
>>>
>>>
>>> ets Jun  8 2016 00:22:57

rst:0x1 (POWERON_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
ets Jun  8 2016 00:22:57

rst:0x10 (RTCWDT_RTC_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:1
load:0x3fff8028,len:8
load:0x3fff8030,len:1728
load:0x4009fa00,len:0
load:0x4009fa00,len:14584
entry 0x400a059c
Booting...
Telnet server started
{'P10': 0, 'wake': 0, 'P18': 0, 'P17': 0}
Pin wake up
Traceback (most recent call last):
  File "main.py", line 42, in <module>
  File "/flash/lib/deepsleep.py", line 184, in go_to_sleep
  File "/flash/lib/deepsleep.py", line 75, in poke
  File "/flash/lib/deepsleep.py", line 48, in _magic
KeyboardInterrupt:
Pycom MicroPython 1.18.0 [v1.8.6-849-046b350] on 2018-06-01; LoPy with ESP32
Type "help()" for more information.
>>>
>>> os.uname()
(sysname='LoPy', nodename='LoPy', release='1.18.0', version='v1.8.6-849-046b350 on 2018-06-01', machine='LoPy with ESP32', lorawan='1.0.2')
>>>