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No, there is no reason to think that you are in danger of carbon monoxide poisoning in this situation. Gas stoves and ovens are designed to burn for long periods of time, and there are many recipes that essentially call for simmering the dish all day.
The potential concern with gas stoves and ovens would have more to do with whether they are getting old and not maintained well. But in this situation, the risk would also be present from high level use of the stove or oven for shorter periods of time.
The risk of carbon monoxide poisoning also is less in a home than in more confined spaces, such as a car, because there is much more air in the house.
If you and others in the house are feeling fine, it is appropriate to open the windows to allow circulation of air for an hour or so, including windows in the bedroom, if possible. Then you can close the windows again if the weather is cold where you are located. There is no reason to be concerned about going to sleep.
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