> ## Documentation Index
> Fetch the complete documentation index at: https://site.aspect.build/llms.txt
> Use this file to discover all available pages before exploring further.
# Time
Blocks the current thread for `ms` milliseconds.
Returns `None`. The sleep is synchronous; the calling task's thread
is parked for the full duration.
# Examples
```python theme={null}
load("@std//time.axl", "sleep")
sleep(250) # pause for 250 ms
```
`function` **sleep\_iter**
Returns an infinite iterator that yields a monotonically increasing integer every `ms` milliseconds.
Each call to `next` sleeps for `ms` milliseconds, then returns the
next tick (starting at `0`). Use `break` to stop iteration.
# Examples
```python theme={null}
load("@std//time.axl", "sleep_iter")
for tick in sleep_iter(1000): # poll once per second
if check_done():
break
```
`function` **monotonic**
Returns a monotonically non-decreasing time in seconds as a float.
The reference epoch is fixed at process start, so values are only
meaningful relative to other `monotonic()` readings within the same
process. Suitable for measuring elapsed time.
# Examples
```python theme={null}
load("@std//time.axl", "monotonic")
start = monotonic()
do_work()
elapsed = monotonic() - start # seconds, as float
```
`function` **monotonic\_ns**
Returns a monotonically non-decreasing time in nanoseconds as an int.
The reference epoch is fixed at process start, so values are only
meaningful relative to other `monotonic_ns()` readings within the
same process. Higher precision than `monotonic()`.
# Examples
```python theme={null}
load("@std//time.axl", "monotonic_ns")
start = monotonic_ns()
do_work()
elapsed_ns = monotonic_ns() - start # nanoseconds, as int
```
`property` **time**